Narrative:

Pre departure clearance: maintain FL230 airborne XA54Z, jan/xa/98. Initial call to bay departure, 'air carrier X 1300 ft climbing FL230.' no immediate response. After other bay departure xmissions, 'air carrier X radar contact.' at 3 NM short of normm intersection, 'air carrier X, turn right 020 degrees, 060 degrees, 070 degrees, climbing through 10700 ft MSL.' 'air carrier X, are you maintaining 10000 ft?' 'negative, we were previously cleared to FL230.' captain began to reduce climb rate. Bay departure, 'ok then expedite through 11000 ft, traffic 10 O'clock, 11000 ft.' captain increased climb rate to 4000-5000 FPM. TCASII RA occurred approximately 11300 ft with a command to descend. Aircraft was climbing 4000-5000 FPM. Captain continued to climb at a high rate and did not descend as such a maneuver would have put the aircraft back to 11000 ft at the same altitude as known traffic. A maneuver to descend the aircraft would have resulted in a very abrupt and dangerous maneuver. TCASII clear of conflict response in 3-5 seconds after RA. Bay departure, 'air carrier X thank you for your help.' frequency change. Other aircraft may have also climbed due to RA.

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Original NASA ASRS Text

Title: APPARENT LOSS OF SEPARATION BTWN A CLBING B757 AND A B747 AT 11000 FT. TCASII RA IGNORED.

Narrative: PDC: MAINTAIN FL230 AIRBORNE XA54Z, JAN/XA/98. INITIAL CALL TO BAY DEP, 'ACR X 1300 FT CLBING FL230.' NO IMMEDIATE RESPONSE. AFTER OTHER BAY DEP XMISSIONS, 'ACR X RADAR CONTACT.' AT 3 NM SHORT OF NORMM INTXN, 'ACR X, TURN R 020 DEGS, 060 DEGS, 070 DEGS, CLBING THROUGH 10700 FT MSL.' 'ACR X, ARE YOU MAINTAINING 10000 FT?' 'NEGATIVE, WE WERE PREVIOUSLY CLRED TO FL230.' CAPT BEGAN TO REDUCE CLB RATE. BAY DEP, 'OK THEN EXPEDITE THROUGH 11000 FT, TFC 10 O'CLOCK, 11000 FT.' CAPT INCREASED CLB RATE TO 4000-5000 FPM. TCASII RA OCCURRED APPROX 11300 FT WITH A COMMAND TO DSND. ACFT WAS CLBING 4000-5000 FPM. CAPT CONTINUED TO CLB AT A HIGH RATE AND DID NOT DSND AS SUCH A MANEUVER WOULD HAVE PUT THE ACFT BACK TO 11000 FT AT THE SAME ALT AS KNOWN TFC. A MANEUVER TO DSND THE ACFT WOULD HAVE RESULTED IN A VERY ABRUPT AND DANGEROUS MANEUVER. TCASII CLR OF CONFLICT RESPONSE IN 3-5 SECONDS AFTER RA. BAY DEP, 'ACR X THANK YOU FOR YOUR HELP.' FREQ CHANGE. OTHER ACFT MAY HAVE ALSO CLBED DUE TO RA.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.